First slide

Travelling wave

Question

A wavelength 0.60 cm is produced in air and it travels at a speed of 300 ms^–1. It will be an

Moderate

A

Audible wave
B

Infrasonic wave
C

Ultrasonic wave
D

None of the above

Solution

$n = \frac{v}{λ} = \frac{300}{0 .6 \times 10^{- 2}} Hz = \frac{3}{6} \times 10^{4} Hz = 50, 000 Hz$
$\Rightarrow$ Wave is ultrasonic.

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